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TextBox.TextChanged Event

Occurs when the content of the text box changes between posts to the server.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public event EventHandler TextChanged
<asp:TextBox OnTextChanged="EventHandler" />

Implements

IEditableTextControl.TextChanged

The TextChanged event is raised when the content of the text box changes between posts to the server.

NoteNote:

A TextBox control must persist some values between posts to the server for this event to work correctly. Be sure that view state is enabled for this control.

For more information about handling events, see Consuming Events.

TopicLocation
How to: Respond to Changes in a TextBox Web Server ControlBuilding ASP .NET Web Applications
How to: Respond to Changes in a TextBox Web Server ControlBuilding ASP .NET Web Applications

The following example shows how to use this event to respond to changes in the TextBox control. The code displays the contents of the Text property of the control in a Label control when the when the Text property is changed. User input in an ASP.NET Web page can include potentially malicious client script. By default, ASP.NET validates that user input does not include script or HTML elements. For more information, see How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings.

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
   Label1.Text = Server.HtmlEncode(TextBox1.Text);
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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